Avancerad sökning

Hittade 4 avhandlingar som matchar ovanstående sökkriterier.

  1. 1. Dynamics of the aphid-ant mutualism

    Författare :Karolina Tegelaar; Olof Leimar; Judith Bronstein; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; mutualism; transgenerational; aphids; aphid-ant; conflict of interest; E -β-farnesene; phenotypic plasticity; predation risk; wing induction; maternal effect; reproductive investment; embryo size; etologi; Ethology;

    Sammanfattning : An appreciation of the role of mutualism is essential when studying ecology and evolution in most ecosystems. Information covering aspects of mutualistic interactions can serve as a complement to the somewhat one-sided perspective from the 1950’s and 60’s that is used when teaching biology. LÄS MER

  3. 2. From environmental cue to phenotypic variation – a functional investigation of wing polyphenism in an emerging model species

    Författare :Erik Gudmunds; Arild Husby; Laura C. Lavine; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Gerris buenoi; water strider; wing polyphenism; photoperiodism; Fat Hippo signaling; Biology with specialization in Evolutionary Genetics; Biologi med inriktning mot evolutionär genetik;

    Sammanfattning : Phenotypic plasticity is a ubiquitous feature of living organisms and enable individuals to adapt to changing environments. A particularly prominent example of plasticity is found in polyphenisms, where environmental cues received during development leads to the generation of discrete variation in populations. LÄS MER

  4. 3. Modeling of Wind Turbines for Power System Studies

    Författare :Tomas Petru; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; flicker; fault response; power quality; wind turbine; power system stability; measurements; prediction; verification; grid simulation; modeling;

    Sammanfattning : The power quality impact of wind turbines on the electric grid and the response of the wind turbines to faults in the electric grid are investigated in this thesis. A detailed model of a stall-regulated, fixed-speed wind turbine system capable of predicting the flicker impact on the connected grid is presented and compared with field measurements. LÄS MER

  5. 4. Drosophila immune responses in a model for epithelial hypertrophy

    Författare :Robert Krautz; Ulrich Theopold; Hugo Stocker; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Molecular Biology; molekylärbiologi;

    Sammanfattning : Apoptosis, differentiation and proliferation have to be tightly balanced and thus regulated to maintain tissue homeostasis. Stress, metabolic cues, genetic variability, infections and physiological host-commensal interactions influence this balance and thus need to be integrated. Therefore, beyond the discrimination between self and non-self (i.e. LÄS MER